Water-tube marine boiler.



M. VALLINO.

WATER TUBE MARINE BOILER. APPLICATION FILED MAY 27. 1913.

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M. VALLINO.

WATER TUBE MARINE BOILER.

APPLICATION FILED MAY 27. I913.

Patented Apr-.13, 1915.

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MARIO VALLINO, 9F GENOA, ITALY, A$SIGNOR TO SOGIETA ANONIMA ITALIANAGIO. ANSALDO 8c 00., 015 GENOA, ITALY.

WATER-TUBE MARINE BOILER.

Application filed May 27, 1913.

To all whom it may concern:

Be it known that I, MARIO VALLINO, a subject of the King of Italy, andresiding at No. 6 Via Napoli, Genoa, lltaly, have invented certain newand useful Improvements in Water-Tube Marine Boilers, of which thefollowing is a specification.

This invention has for its object to provide an improved water tubemarine boiler of the type wherein two transversely arranged upper steamand water drums are connected to each other and also to two transverselyarranged lower water drums, by means of groups or bundles of tubes lo-'cated above the combustion chamber.

In the improved steam boiler means are provided, whereby the heat whichwould otherwise escape to waste through the chimney, is utilized forheating the feed water.

This invention is illustrated by way of example in the accompanyingdrawings, in which Figure 1 is a vertical cross section of one form ofthe improved boiler, and Fig. 2 is a rear elevation, partly in sectionthereof. Fig. 3 is an elevation of the top rear drum with feed waterconnection.

As shown, 2 is an upper steam and water drum located transversely at thefront of the boiler, and 3 is an upper transverse steam and water drumlocated at the back of the boiler. These two drums are connected to eachother by a group of tubes 5 and also by two pipes 11. 1 and 17 are lowerwater drums located transversely and respectively at the front and backof the boiler. The upper drum 2 is connected to the lower drum 1 bytubes 6. The upper drum 3 is connected to the lower drum 1 by diagonallyarranged tubes 4 and to the lower drum 17 by tubes 14.

The two lower drums 1 and 17 are connected to each other by two pipes15.

The boiler is incased in a steel casing 16 covered with asbestos, in theupper part of which is an outlet-13 for the smoke gases.

The groups of tubes 5 may be worked as an economizer when the feed wateris in jected cold under the plate 8; and they may be worked as a steamgenerating group when the feed water is injected outside the plate 8.

The rear top drum is fitted with a twoway water connection by which thefeed watar is directed to the pipe under the plate a Specification ofLetters Patent.

Patented Apr. 13, 1915.

Serial No. 770,197.

r or outside the said plate by means of the two valves in the valve box18.

The circulation of the water in the improved boiler is as follows :Thecirculation commences by the water rising from the lower'drum 1 to theupper drum 3 through the tubes 4 owing to these tubes receiving thedirect heat from the fuel on the grate 12. The steam generated inthetubes 4 collects in the space 10 in the upper drum 3. The waterpasses from this drum 3 underneath the plate 8 and through the tubes 5into the upper drum 2. From this latter drum the water descends throughthe tubes 6 (which are least exposed to the heat of the furnace) intothe lower drum 1. l/Vith this course of the circulation, and when thefeed water is injected into the boiler outside the plate 8 through thepipe 7*, the tubes 5 will operate as steam-generating tubes, and theimproved boiler will work like any other boiler without an economizer,because in such a case the temperature of the water flowing through thetubes 5 will be the same as that of the body of the water in the boiler.The steam generated in the tubes 5 will collect in the space 9 in theupper drum 2 which is in communication by means of the pipes 11 with thespace 10 of the upper drum 3. If, however, the feed water be firstinjected into the upper drum 3 by means of the pipe 7 which leads itdirectly under the plate 8, then the tubes 5 will operate as economizertubes because the feed water in mingling with the hot water which iscarried by the natural current of the boiler water through the tubes 5,will form a mixture of water of lower temperature than that contained inthe other parts of the boiler. The temperature of the tubes 5 willtherefore be lowered and the surfaces of these tubes will become moreeffective by their contact with the hot gases passing to the chimney 13,owing to the increased difference between the temperature of the saidsurfaces and that of the hot gases, which could not occur in the firstmentioned arrangement. This increased effectiveness will produce thehigher efficiency of the improved boiler which is the object of thisinvention.

Having now described my invention what ll claim as new and desire tosecure by Letters Patent is 1. In a. water tube steam boiler of the typehereinbefore specified, the Combination with a rear transverse uppersteam and Water drum, and a front transverse upper steam and water drumof connecting tubesexposed to the hot furnace gases, connecting thewater space of said rear upper drum with the water space of said frontupper drum, a chamber in the water space of said rear upper druminclosing the orifices of said connecting tubes, and feed water supplypipes for delivering into or outside the said chamber, whereby saidconnecting tubes are enabled to operate if desired, as the tubes of aneconomizer for heating the feed water before delivering same into saidfront upper drum;

2, In a water tube steam boiler of the type hereinbefore specified, thecombination with a rear transverse upper steam and water drum, and afront transverse upper steam and water drum, a lower water drum, watertubes located directly over the fire, extending diagonally from thewater space of said rear upper drum to said lower water drum,

pipes connecting the steam space of said rear upper drum with the steamspace of said front upper drum and down tubes connecting the water spaceof said front upper drum With said lower drum, of connecting tubesexposed to the hot furnace gases, connecting the water space of saidrear upper drum with the water space of said front upper drum, a chamberin the Water space of said rear upper drum inclosing the orifices ofsaid connecting tubes, and feed water supply pipes for delivering intoor outside the said chamber, whereby said connecting tubes are enabledto operate if desired as the tubes of an econolnizer for heating thefeed water before delivering same into said front upper drum.

In testimony whereof I affix my signature in presence of two witnesses.

MARIO VALLINO.

Witnesses GHERARDI, Grnsnrrn PARODIL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

